Search results for "TF"
showing 10 items of 1652 documents
Influence des pratiques d’allaitement et de diversification sur l’acceptation de flaveurs nouvelles chez le jeune enfant : variabilité intra- et inte…
2007
This thesis covers three separate but related studies. The first, a questionnaire survey of infant feeding practices in two nearby European regions (Dijon, France and Aalen, Germany) reports between- and withinregion differences in breastfeeding duration and variety of vegetables offered early in weaning. This survey identified the level and rate of vegetable variety and the specific foods to use in a second study. The 2nd study examined the effects of breast- or formula-feeding and different levels of vegetable variety (no, low or high) early in weaning on acceptance (intake and liking) of new foods. The foods were: (1) a first new vegetable offered immediately after the intervention; (2) …
Cryptic diversity, niche displacement and our poor understanding of taxonomy and ecology of aquatic microorganisms
2022
AbstractThe analysis of ecological niche is an important task to correctly identify the role exerted by species within ecosystems, to assess their vulnerability, to plan effective measures addressed at fulfilling the postulates of biological conservation, and ultimately to prevent biodiversity loss. However, for the majority of organisms our knowledge about the actual extent of their ecological niche is quite limited. This is especially true for microscopic organisms. Evidence exists that in different geographical areas allegedly conspecific populations can show different, if not antithetical, ecological requirements and not-overlapping ecological niches. This opinion paper discusses whethe…
Gestión eficiente de carteras: Modelo de Markowitz y el Ibex-35
2019
El objetivo de este trabajo es construir con el máximo detalle posible una frontera eficiente de acuerdo al modelo de Harry Markowitz, conocer con profundidad el modelo y comparar sus resultados con diversos índices bursátiles para analizar el efecto que tiene una diversificación eficiente sobre el rendimiento y el riesgo de una cartera. Para ello nos basaremos en datos históricos del IBEX-35 a los que aplicaremos el modelo con ayuda de distintos programas informáticos de optimización. Veremos cómo realmente sí que es posible crear carteras con menor volatilidad que los títulos que forman el mercado, como es posible que títulos con rendimientos esperados negativos formen parte de carteras e…
Finnish vocational education and training in comparison: Strengths and weaknesses
2014
International journal for research in vocational education and training 1 (2014) 2, S. 81-106
Unbundling technology adoption and tfp at the firm level. Do intangibles matter?
2012
We use a panel of European firms to investigate the relationship between intangible assets and productivity. We distinguish between total factor productivity (tfp) and technology adoption, whereas standard estimations consider only a notion of productivity that conflates the two effects. Although we are unable to address simultaneity, we allow for the existence of multiple technologies within sectors through a mixture model approach. We find that intangible assets have nonnegligible effects that both push firms toward better technologies (technology adoption effects) and allow for more efficient exploitation of a given technology (tfp effects).
Venture Capitalists' Decision to Syndicate.
2006
International audience; Financial theory, access to deal flow, selection, and monitoring skills are used to explain syndication in venture capital firms in six European countries. In contrast with U.S. findings, portfolio management motives are more important for syndication than individual deal management motives. Risk sharing, portfolio diversification, and access to larger deals are more important than selection and monitoring of deals. This holds for later stage and for early stage investors. Value adding is a stronger motive for syndication for early stage investors than for later stage investors, however. Nonlead investors join syndicates for the selection and value-adding skills of t…
Uncertainty and cross-border banking flows
2019
Abstract While global uncertainty—measured by the VIX—has proven to be a robust global “push” factor of international capital flows, there has been no systematic study assessing the role of uncertainty in driving bilateral capital flows. This paper examines the effects of higher country-specific uncertainty on cross-border banking flows using data from the Bank for International Settlements Locational Banking Statistics. The bilateral structure of this data allows disentangling supply factors from demand factors, thereby helping identify the effect of higher uncertainty on cross-border banking flows from other confounding factors. The results of this analysis suggest that: (i) uncertainty i…
The devil is in the details : Capital stock estimation and aggregate productivity growth : an application to the Spanish economy
2020
The variables that contribute to explaining the major puzzles and paradoxes in macroeconomics and economic growth literature always appear related, directly or indirectly, to capital stock and depreciation. Depreciation defined in a narrow sense refers only to physical wear and tear, but in a broader sense, it also includes economic deterioration and obsolescence. In this study, we explore the link between these two depreciation concepts, the capital deepening and total factor productivity (TFP) growth. We propose a double growth accounting framework that allows us to establish a relationship between variables in statistical terms and variables in economic terms. Then, with Spanish data for…
How does learning affect market liquidity? A simulation analysis of a double-auction financial market with portfolio traders
2007
We study the relationship between liquidity and prices in an artificial financial market where portfolio traders with limited resources interact through a continuous, electronic open book. We depart from the standard asset pricing framework in two ways. First, we assume that investors have incomplete information about the distribution of returns. Second, we model the portfolio choice problem using prospect-type preferences. We model the utility function in terms of deviations of the portfolio growth rate from a specified target growth rate, and we assume that investors are more sensitive to downside movements. We show that the parameters defining the learning process affect the price dynami…
Weak efficiency of the cryptocurrency market: a market portfolio approach
2019
ABSTRACTCryptocurrencies have attracted the attention of many investors and policymakers given the increase in popularity of Bitcoin. In this context, we analyse the cryptocurrency market by means ...